I'm trying to build a simple job from scripts in a git repo and copy another file from the filesystem using the File System SCM and Multiple SCMs plugins. I can copy the file system directory by itself as the only SCM without Multiple SCMs configured. I can also checkout from git, but when I add the File System SCM under Multiple SCMs and configure the path I get this error in the console output log:

FSSCM.checkout to /home/user/.jenkins/workspace/Projects/Build Test
FATAL: Parameter 'directory' is not a directory

Going back to re-configure the build, I find that the file system path is empty, so it doesn't seem to be correctly saving this parameter.